Added SDNC MDSAL Data Migrator Functionality.

Change-Id: I63ec1a4674d3a3cc6b39708ddee18ae7f9040b1c
Issue-ID: SDNC-223
Signed-off-by: ankitbhatt <ankit.bhatt@amdocs.com>

Former-commit-id: c4c27b78ff6b4a8f22553ef3d19aec67edd17482

10 files changed, 809 insertions, 0 deletions

diff --git a/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/DataMigration.java b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/DataMigration.java
new file mode 100644
index 00000000..ac53f448
--- /dev/null
+++ b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/DataMigration.java
@@ -0,0 +1,39 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : SDNC
+ * ================================================================================
+ * Copyright 2019 AMDOCS
+ *=================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.sdnc.oam.datamigrator;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class DataMigration {
+
+    private static final Logger LOG = LoggerFactory.getLogger(DataMigration.class);
+
+    public static void main(String[] args) {
+        try {
+            DataMigrationInternal dataMigrationInternal = new DataMigrationInternal(LOG);
+            dataMigrationInternal.run(args);
+        }catch (Exception e){
+            e.printStackTrace();
+            LOG.error("Error in DataMigration" + e.getMessage());
+        }
+        return;
+    }
+}
diff --git a/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/DataMigrationInternal.java b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/DataMigrationInternal.java
new file mode 100644
index 00000000..ae497235
--- /dev/null
+++ b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/DataMigrationInternal.java
@@ -0,0 +1,148 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : SDNC
+ * ================================================================================
+ * Copyright 2019 AMDOCS
+ *=================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.sdnc.oam.datamigrator;
+
+import com.beust.jcommander.JCommander;
+import com.beust.jcommander.Parameter;
+import com.beust.jcommander.Strings;
+import org.onap.sdnc.oam.datamigrator.common.Description;
+import org.onap.sdnc.oam.datamigrator.common.MigratorConfiguration;
+import org.onap.sdnc.oam.datamigrator.common.Operation;
+import org.onap.sdnc.oam.datamigrator.migrators.Migrator;
+import org.reflections.Reflections;
+import org.slf4j.Logger;
+
+import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+public class DataMigrationInternal {
+
+    private final Logger log;
+
+    public DataMigrationInternal(Logger log) {
+        this.log = log;
+    }
+
+    private void logAndPrint(String msg) {
+        System.out.println(msg);
+        log.info(msg);
+    }
+
+    public void run(String[] args){
+        CommandLineArgs cArgs = new CommandLineArgs();
+        JCommander jCommander = new JCommander(cArgs, args);
+        jCommander.setProgramName(DataMigration.class.getSimpleName());
+
+        if (cArgs.help) {
+            jCommander.usage();
+            return;
+        }
+
+        Set<Class<? extends Migrator>> migratorList = getMigratorList();
+        if(cArgs.scripts.size() > 0){
+            migratorList = migratorList.stream().filter(aClass -> cArgs.scripts.contains(aClass.getSimpleName())).collect(Collectors.toSet());
+        }
+        if(cArgs.excludeClasses.size() > 0){
+            migratorList = migratorList.stream().filter(aClass -> !cArgs.excludeClasses.contains(aClass.getSimpleName())).collect(Collectors.toSet());
+        }
+
+        if(migratorList.size()>0) {
+            logAndPrint("Total number of available migrations: " + migratorList.size());
+            if(cArgs.list) {
+                logAndPrint("List of available migrations:");
+                for (Class<? extends Migrator> migrator : migratorList) {
+                    if(migrator.getAnnotation(Description.class) != null && !migrator.getAnnotation(Description.class).value().isEmpty()) {
+                        logAndPrint(migrator.getSimpleName()+ ": " + migrator.getAnnotation(Description.class).value() );
+                    }else {
+                        logAndPrint(migrator.getSimpleName());
+                    }
+                }
+            }else {
+                Operation operation;
+                try {
+                    operation = Operation.valueOf(cArgs.operation.toUpperCase());
+                    logAndPrint("Starting operation: " + operation.name());
+                }catch (IllegalArgumentException e) {
+                    logAndPrint("Invalid operation: " + cArgs.operation +". Supported operations are: Migrate, Backup, Restore.");
+                    return;
+                }
+                boolean success = true;
+                MigratorConfiguration config;
+                if(!Strings.isStringEmpty(cArgs.config)){
+                    config = new MigratorConfiguration(cArgs.config);
+                }else {
+                    logAndPrint("No external configuration provided. Initializing Default configuration.");
+                    config = new MigratorConfiguration();
+                }
+                for (Class<? extends Migrator> migratorClass : migratorList) {
+                    logAndPrint("Started executing migrator: "+ migratorClass.getSimpleName());
+                    try {
+                        Migrator migrator =  migratorClass.newInstance();
+                        migrator.init(config);
+                        migrator.run(operation);
+                        success = success && migrator.isSuccess();
+                    } catch (InstantiationException | IllegalAccessException e) {
+                        logAndPrint("Error instantiating migrator: " + migratorClass);
+                        success=false;
+                    }
+                    logAndPrint("Completed execution for migrator "+ migratorClass.getSimpleName() +" with status: " + success);
+                }
+                if(success){
+                    logAndPrint(operation.name()+ " operation completed Successfully.");
+                }else{
+                    logAndPrint("Error during "+ operation.name() +" operation. Check logs for details.");
+                }
+            }
+        }else{
+            logAndPrint("No migrations available.");
+        }
+    }
+
+    private Set<Class<? extends Migrator>> getMigratorList() {
+        Reflections reflections = new Reflections("org.onap.sdnc.oam.datamigrator.migrators");
+        return reflections.getSubTypesOf(Migrator.class).stream().filter(aClass -> !Modifier.isAbstract(aClass.getModifiers())).collect(Collectors.toSet());
+    }
+
+    class CommandLineArgs {
+
+        @Parameter(names = "--h", help = true)
+        public boolean help;
+
+        @Parameter(names = "-o", description = "Operation to be performed. Default is Migrate. Supported operations: Migrate , Backup , Restore.")
+        public String operation = "Migrate";
+
+        @Parameter(names = "-c", description = "Configuration File path / directory")
+        public String config;
+
+        @Parameter(names = "-m", description = "Names of migration scripts to run")
+        public List<String> scripts = new ArrayList<>();
+
+        @Parameter(names = "-l", description = "List the available of migrations")
+        public boolean list = false;
+
+        @Parameter(names = "-e", description = "Exclude list of migrator classes")
+        public List<String> excludeClasses = new ArrayList<>();
+    }
+
+
+}
diff --git a/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/common/Description.java b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/common/Description.java
new file mode 100644
index 00000000..3eaf562d
--- /dev/null
+++ b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/common/Description.java
@@ -0,0 +1,31 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : SDNC
+ * ================================================================================
+ * Copyright 2019 AMDOCS
+ *=================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.sdnc.oam.datamigrator.common;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface Description {
+    String value() default "";
+}
diff --git a/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/common/MigratorConfiguration.java b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/common/MigratorConfiguration.java
new file mode 100644
index 00000000..40a1b920
--- /dev/null
+++ b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/common/MigratorConfiguration.java
@@ -0,0 +1,118 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : SDNC
+ * ================================================================================
+ * Copyright 2019 AMDOCS
+ *=================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.sdnc.oam.datamigrator.common;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.net.URL;
+import java.util.Properties;
+
+public class MigratorConfiguration {
+
+    private String sourceHost ;
+    private String sourceUser ;
+    private String sourcePassword ;
+    private String targetHost ;
+    private String targetUser ;
+    private String targetPassword ;
+    private String dataPath;
+
+    private static final String SDNC_CONFIG_DIR = "SDNC_CONFIG_DIR";
+    private static final Logger LOG = LoggerFactory
+            .getLogger(MigratorConfiguration.class);
+
+    public MigratorConfiguration (){
+        String propDir = System.getenv(SDNC_CONFIG_DIR);
+        if (propDir == null) {
+            propDir = "/opt/sdnc/data/properties";
+        }
+        try {
+            init(propDir);
+        } catch (Exception e) {
+            LOG.error("Cannot initialize MigratorConfiguration", e);
+        }
+    }
+
+    public MigratorConfiguration (String propDir){
+        try {
+            init(propDir);
+        } catch (Exception e) {
+            LOG.error("Cannot initialize MigratorConfiguration", e);
+        }
+    }
+
+    public void init(String propDir) throws IOException {
+        String propPath = propDir + "/data-migrator.properties";
+        URL propPathUrl= getClass().getClassLoader().getResource(propPath);
+        File propFile = (propPathUrl != null) ? new File(propPathUrl.getFile()) : new File(propPath); 
+        if (!propFile.exists()) {
+            throw new FileNotFoundException(
+                    "Missing configuration properties file : "
+                            + propFile);
+        }
+
+        Properties props = new Properties();
+        props.load(new FileInputStream(propFile));
+        this.sourceHost = props.getProperty("org.onap.sdnc.datamigrator.source.host");
+        this.sourceUser = props.getProperty("org.onap.sdnc.datamigrator.source.user");
+        this.sourcePassword = props.getProperty("org.onap.sdnc.datamigrator.source.password");
+        this.targetHost = props.getProperty("org.onap.sdnc.datamigrator.target.host");
+        this.targetUser = props.getProperty("org.onap.sdnc.datamigrator.target.user");
+        this.targetPassword = props.getProperty("org.onap.sdnc.datamigrator.target.password");
+        this.dataPath = props.getProperty("org.onap.sdnc.datamigrator.data.path");
+    }
+
+    public String getSourceHost() {
+        return sourceHost;
+    }
+
+    public String getSourceUser() {
+        return sourceUser;
+    }
+
+    public String getSourcePassword() {
+        return sourcePassword;
+    }
+
+    public String getTargetHost() {
+        return targetHost;
+    }
+
+    public String getTargetUser() {
+        return targetUser;
+    }
+
+    public String getTargetPassword() {
+        return targetPassword;
+    }
+
+    public String getDataPath() {
+        return dataPath;
+    }
+
+    public void setDataPath(String dataPath) {
+        this.dataPath = dataPath;
+    }
+}
diff --git a/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/common/Operation.java b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/common/Operation.java
new file mode 100644
index 00000000..df6cd00a
--- /dev/null
+++ b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/common/Operation.java
@@ -0,0 +1,24 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : SDNC
+ * ================================================================================
+ * Copyright 2019 AMDOCS
+ *=================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.sdnc.oam.datamigrator.common;
+
+public enum Operation {
+    RESTORE,MIGRATE,BACKUP
+}
diff --git a/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/common/RestconfClient.java b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/common/RestconfClient.java
new file mode 100644
index 00000000..b7722b6d
--- /dev/null
+++ b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/common/RestconfClient.java
@@ -0,0 +1,144 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : SDNC
+ * ================================================================================
+ * Copyright 2019 AMDOCS
+ *=================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.sdnc.oam.datamigrator.common;
+
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import org.onap.sdnc.oam.datamigrator.exceptions.RestconfException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.HttpsURLConnection;
+import java.io.BufferedReader;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.Authenticator;
+import java.net.HttpURLConnection;
+import java.net.PasswordAuthentication;
+import java.net.URL;
+import java.util.Base64;
+
+public class RestconfClient {
+
+    private HttpURLConnection httpConn = null;
+    private final String host ;
+    private final String user ;
+    private final String password ;
+    private static final String CONFIG_PATH = "/restconf/config/";
+    private static final String CONTENT_TYPE_JSON = "application/json";
+    private final Logger log = LoggerFactory.getLogger(RestconfClient.class);
+
+    public RestconfClient (String host , String user , String password){
+        this.host = host;
+        this.user = user;
+        this.password = password;
+    }
+
+    private class SdncAuthenticator extends Authenticator {
+
+        private final String user;
+        private final String passwd;
+
+        SdncAuthenticator(String user, String passwd) {
+            this.user = user;
+            this.passwd = passwd;
+        }
+        @Override
+        protected PasswordAuthentication getPasswordAuthentication() {
+            return new PasswordAuthentication(user, passwd.toCharArray());
+        }
+    }
+
+    public JsonObject get(String path) throws RestconfException {
+            String getResponse = send(path,"GET",CONTENT_TYPE_JSON,"");
+            JsonParser parser = new JsonParser();
+            return parser.parse(getResponse).getAsJsonObject();
+    }
+
+    public void put(String path, String data) throws RestconfException {
+            send(path,"PUT",CONTENT_TYPE_JSON, data );
+    }
+
+    private String send(String path,String method, String contentType, String msg) throws RestconfException {
+        Authenticator.setDefault(new SdncAuthenticator(user, password));
+        String url = host + CONFIG_PATH + path;
+        try {
+            URL sdncUrl = new URL(url);
+            log.info("SDNC url: " + url);
+            log.info("Method: " + method);
+            this.httpConn = (HttpURLConnection) sdncUrl.openConnection();
+            String authStr = user + ":" + password;
+            String encodedAuthStr = new String(Base64.getEncoder().encode(authStr.getBytes()));
+            httpConn.addRequestProperty("Authentication", "Basic " + encodedAuthStr);
+
+            httpConn.setRequestMethod(method);
+            httpConn.setRequestProperty("Content-Type", contentType);
+            httpConn.setRequestProperty("Accept", contentType);
+
+            httpConn.setDoInput(true);
+            httpConn.setDoOutput(true);
+            httpConn.setUseCaches(false);
+
+            if (httpConn instanceof HttpsURLConnection) {
+                HostnameVerifier hostnameVerifier = (hostname, session) -> true;
+                ((HttpsURLConnection) httpConn).setHostnameVerifier(hostnameVerifier);
+            }
+            if (!method.equals("GET")) {
+                log.info("Request payload: " + msg);
+                httpConn.setRequestProperty("Content-Length", "" + msg.length());
+                DataOutputStream outStr = new DataOutputStream(httpConn.getOutputStream());
+                outStr.write(msg.getBytes());
+                outStr.close();
+            }
+
+            BufferedReader respRdr;
+            log.info("Response: " + httpConn.getResponseCode() + " " + httpConn.getResponseMessage());
+
+            if (httpConn.getResponseCode() < 300) {
+                respRdr = new BufferedReader(new InputStreamReader(httpConn.getInputStream()));
+            } else {
+                respRdr = new BufferedReader(new InputStreamReader(httpConn.getErrorStream()));
+                log.error("Error during restconf operation: "+ method + ". URL:" + sdncUrl.toString()+". Response:"+respRdr);
+                throw new RestconfException(httpConn.getResponseCode(),"Error during restconf operation: "+ method +". Response:"+respRdr);
+            }
+
+            StringBuilder respBuff = new StringBuilder();
+            String respLn;
+            while ((respLn = respRdr.readLine()) != null) {
+                respBuff.append(respLn).append("\n");
+            }
+            respRdr.close();
+            String respString = respBuff.toString();
+
+            log.info("Response body :\n" + respString);
+            return respString;
+        }catch (IOException e){
+            throw new RestconfException(500,e.getMessage(),e);
+        }finally {
+            if (httpConn != null) {
+                httpConn.disconnect();
+            }
+        }
+    }
+
+
+}
diff --git a/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/exceptions/RestconfException.java b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/exceptions/RestconfException.java
new file mode 100644
index 00000000..6b714c29
--- /dev/null
+++ b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/exceptions/RestconfException.java
@@ -0,0 +1,46 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : SDNC
+ * ================================================================================
+ * Copyright 2019 AMDOCS
+ *=================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.sdnc.oam.datamigrator.exceptions;
+
+public class RestconfException extends Exception{
+
+    private final int errorCode;
+    private final String errorMessage;
+
+    public RestconfException(int errorCode, String errorMessage) {
+        super(errorMessage);
+        this.errorCode = errorCode;
+        this.errorMessage = errorMessage;
+    }
+
+    public RestconfException(int errorCode, String errorMessage, Throwable e) {
+        super(errorMessage,e);
+        this.errorCode = errorCode;
+        this.errorMessage = errorMessage;
+    }
+
+    public int getErrorCode() {
+        return errorCode;
+    }
+
+    public String getErrorMessage() {
+        return errorMessage;
+    }
+}
diff --git a/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/migrators/Migrator.java b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/migrators/Migrator.java
new file mode 100644
index 00000000..e44a2c73
--- /dev/null
+++ b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/migrators/Migrator.java
@@ -0,0 +1,136 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : SDNC
+ * ================================================================================
+ * Copyright 2019 AMDOCS
+ *=================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.sdnc.oam.datamigrator.migrators;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonObject;
+import org.onap.sdnc.oam.datamigrator.common.MigratorConfiguration;
+import org.onap.sdnc.oam.datamigrator.common.Operation;
+import org.onap.sdnc.oam.datamigrator.common.RestconfClient;
+import org.onap.sdnc.oam.datamigrator.exceptions.RestconfException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+
+public abstract class Migrator {
+
+    protected RestconfClient sourceClient;
+    protected RestconfClient targetClient;
+    protected boolean success = true;
+    private MigratorConfiguration config;
+    private final Logger log = LoggerFactory.getLogger(PreloadInformationMigrator.class);
+
+
+    public void run(Operation operation){
+        {
+            JsonObject sourceData;
+            if(operation != Operation.RESTORE) {
+
+                try {
+                    sourceData = sourceClient.get(getYangModuleName()+":"+ getSourcePath());
+                    if(operation == Operation.BACKUP){
+                        String fileName = getFileName();
+                        try {
+                            BufferedWriter writer = new BufferedWriter(new FileWriter(fileName));
+                            writer.write(sourceData.toString());
+                            writer.close();
+                        } catch (IOException e) {
+                            log.error("Error writing data to file : " + fileName, e);
+                            success = false;
+                            return;
+                        }
+                        return;
+                    }
+                } catch (RestconfException e) {
+                    if(e.getErrorCode() == 404){
+                        log.error("No data available for migration. Returning silent success.", e);
+                        success = true;
+                    }else {
+                        log.error("Error retrieving data from MD-SAL store. Error code: " + e.getErrorCode() + ". Error message:" + e.getErrorMessage(), e);
+                        success = false;
+                    }
+                    return;
+                }
+            }else {
+                String fileName = getFileName();
+                try {
+                    Gson gson = new Gson();
+                    sourceData = gson.fromJson(new BufferedReader(new FileReader(fileName)),JsonObject.class);
+                } catch (IOException e) {
+                    log.error("Error Reading data from file : " + fileName, e);
+                    success = false;
+                    return;
+                }
+            }
+            try {
+                String targetData = convertData(sourceData);
+                targetClient.put(getYangModuleName()+":"+ getTargetPath(),targetData);
+            } catch (RestconfException e) {
+                log.error("Error loading data to MD-SAL store. Error code: "+e.getErrorCode()+". Error message:"+e.getErrorMessage(),e);
+                success=false;
+            }
+        }
+    }
+
+    private String getFileName() {
+        return config.getDataPath()+ "/" + getYangModuleName()+ "_"+ getSourcePath()+"_"+ getTargetPath() + ".json";
+    }
+
+    protected abstract String convertData(JsonObject sourceData);
+
+    public abstract String getYangModuleName();
+    public abstract String getSourcePath();
+    public abstract String getTargetPath();
+
+    public void init(MigratorConfiguration config){
+        this.config = config;
+        sourceClient = new RestconfClient(config.getSourceHost(),config.getSourceUser(),config.getSourcePassword());
+        targetClient = new RestconfClient(config.getTargetHost(),config.getTargetUser(),config.getTargetPassword());
+    }
+
+    public RestconfClient getSourceClient() {
+        return sourceClient;
+    }
+
+    public void setSourceClient(RestconfClient sourceClient) {
+        this.sourceClient = sourceClient;
+    }
+
+    public RestconfClient getTargetClient() {
+        return targetClient;
+    }
+
+    public void setTargetClient(RestconfClient targetClient) {
+        this.targetClient = targetClient;
+    }
+
+    public boolean isSuccess() {
+        return success;
+    }
+
+    public void setSuccess(boolean success) {
+        this.success = success;
+    }
+}
+
diff --git a/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/migrators/PreloadInformationMigrator.java b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/migrators/PreloadInformationMigrator.java
new file mode 100644
index 00000000..d259c216
--- /dev/null
+++ b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/migrators/PreloadInformationMigrator.java
@@ -0,0 +1,61 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : SDNC
+ * ================================================================================
+ * Copyright 2019 AMDOCS
+ *=================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.sdnc.oam.datamigrator.migrators;
+
+import org.onap.sdnc.oam.datamigrator.common.Description;
+
+import java.util.HashMap;
+import java.util.HashSet;
+
+@Description("Migrator for container 'preload-vnf' in GENERIC-RESOURCE-API.yang")
+public class PreloadInformationMigrator extends RenameDeleteLeafMigrator {
+
+    private static final String YANG_MODULE = "GENERIC-RESOURCE-API";
+
+    static{
+        deletedFields = new HashSet<>();
+        deletedFields.add("preload-vnfs.vnf-preload-list.preload-data.vnf-topology-information");
+        deletedFields.add("preload-vnfs.vnf-preload-list.preload-data.network-topology-information.network-topology-identifier.service-type");
+        deletedFields.add("preload-vnfs.vnf-preload-list.preload-data.oper-status.last-action");
+        renamedFields = new HashMap<>();
+        renamedFields.put("preload-vnfs","preload-information");
+        renamedFields.put("preload-vnfs.vnf-preload-list","preload-list");
+        renamedFields.put("preload-vnfs.vnf-preload-list.vnf-type","preload-type");
+        renamedFields.put("preload-vnfs.vnf-preload-list.vnf-name","preload-id");
+        renamedFields.put("preload-vnfs.vnf-preload-list.preload-data.oper-status","preload-oper-status");
+        renamedFields.put("preload-vnfs.vnf-preload-list.preload-data.network-topology-information","preload-network-topology-information");
+        renamedFields.put("preload-vnfs.vnf-preload-list.preload-data.network-topology-information.network-topology-identifier","network-topology-identifier-structure");
+    }
+
+    @Override
+    public String getYangModuleName() {
+        return YANG_MODULE;
+    }
+
+    @Override
+    public String getSourcePath() {
+        return "preload-vnfs";
+    }
+
+    @Override
+    public String getTargetPath() {
+        return "preload-information";
+    }
+}
diff --git a/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/migrators/RenameDeleteLeafMigrator.java b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/migrators/RenameDeleteLeafMigrator.java
new file mode 100644
index 00000000..8c0adc0c
--- /dev/null
+++ b/data-migrator/src/main/java/org/onap/sdnc/oam/datamigrator/migrators/RenameDeleteLeafMigrator.java
@@ -0,0 +1,62 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : SDNC
+ * ================================================================================
+ * Copyright 2019 AMDOCS
+ *=================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.sdnc.oam.datamigrator.migrators;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import org.apache.commons.lang3.StringUtils;
+import java.util.Map;
+import java.util.Set;
+
+public abstract class RenameDeleteLeafMigrator extends Migrator {
+
+    protected static Map<String,String> renamedFields ;
+    protected static Set<String> deletedFields ;
+
+    @Override
+    protected String convertData(JsonObject sourceData) {
+        JsonObject target =  convert(sourceData,"");
+        return  target.toString();
+    }
+
+    protected JsonObject convert(JsonObject source,String parent) {
+        JsonObject target = new JsonObject();
+        for (String key : source.keySet()){
+            String prefixKey = StringUtils.isNotEmpty(parent) ? parent + "."+key : key;
+            if(!deletedFields.contains(prefixKey)) {
+                JsonElement value = source.get(key);
+                if (value.isJsonPrimitive()) {
+                    target.add(renamedFields.getOrDefault(prefixKey,key), value);
+                } else if(value.isJsonArray()){
+                    JsonArray targetList = new JsonArray();
+                    JsonArray sourceArray = value.getAsJsonArray();
+                    for(JsonElement  e : sourceArray){
+                         targetList.add(convert(e.getAsJsonObject(),prefixKey));
+                    }
+                    target.add(renamedFields.getOrDefault(prefixKey,key), targetList);
+                } else{
+                    target.add(renamedFields.getOrDefault(prefixKey,key), convert(value.getAsJsonObject(),prefixKey));
+                }
+            }
+        }
+        return target;
+    }
+}